Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Relativity
Relativistic Doppler Effect Calculator
Compute the observed frequency and wavelength when a light source moves toward or away from you at relativistic speeds. Used in astrophysics to analyze spectra of fast-moving stars, galaxies, and spacecraft.
Fill in the required fields to see your result.
Relativity
Relativistic Escape Velocity Calculator
Calculates the escape velocity from a massive body using a relativistic correction for the Schwarzschild geometry. Useful for neutron stars, white dwarfs, and objects near black hole thresholds.
Fill in the required fields to see your result.
Key differences
| Relativistic Doppler Effect Calculator | Relativistic Escape Velocity Calculator | |
|---|---|---|
| Category | Relativity | Relativity |
| Inputs required | 3 | 2 |
| Result | Observed Frequency (Hz) | Escape Velocity (fraction of c) |
| What it does | Compute the observed frequency and wavelength when a light source moves toward or away from you at relativistic speeds. Used in astrophysics to analyze spectra of fast-moving stars, galaxies, and spacecraft. | Calculates the escape velocity from a massive body using a relativistic correction for the Schwarzschild geometry. Useful for neutron stars, white dwarfs, and objects near black hole thresholds. |